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The world's best gem articles, published weekly.
Most Recent Articles
What is a Trapiche Emerald?
Trapiche emerald gems are some of the world’s rarest emeralds. Learn where they’re found and how their characteristic “spoked wheel” patterns are formed.
Hurlbutite Value, Price, and Jewelry Information
Hurlbutite is an extremely rare mineral. Minute, colorless faceted stones have been cut from fragments.
A Consumer’s Guide to Gem Grading
Learn how gemologists evaluate color, clarity, cut, and carat for gem grading. Consumers can use this information to find the right stone for their needs.
A Guide to Understanding the Inner Workings of the Gem Trade
Based on interviews with gem trade experts, this series of FAQs addresses many topics, such as gem value, investing, insurance, and collecting.
What are Allochromatic and Idiochromatic Gems?
Learn the difference between allochromatic and idiochromatic gems and why some gem species can occur in many color varieties and others occur only in one.
Sphalerite Buying Guide
Our sphalerite buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.
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Sign up for a Pro Membership"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member
